63791

Appears in sequences

• Sum of numbers that can be written as t*n + u*(n+1) for nonnegative integers t,u in exactly two ways.at n=12A076455
• a(n) is the first composite number having the same base-n digits as its prime factors (with multiplicity), excluding zero digits (or 0 if no such composite number exists).at n=13A278981
• a(n) is the smallest composite number having the same base-n digits (both type and quantity) as its prime factors (with multiplicity).at n=13A281336
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, n) )^2.at n=14A371492